A car's velocity changes from 0 m/s to 30 m/s, 10 seconds later. What is the car's acceleration?
a. -3m/s²
b. +0.3m/s²
c. -0.3m/s²
d. +3m/s²
Answers
Answer:
d. +3m/s²
Explanation:
\(a = \frac{v - u}{t} \)
Where v is the final velocity and u the initial velocity.
The final velocity would be 30m/s and initial velocity 0m/s
Time is 10 secs
\(a = \frac{30 -0 }{10 } \\ = \frac{30}{10} \\ = 3\)
Therefore the acceleration is +3m/s²
Related Questions
A bullet was fired from a gun. The bullet had a mass of 50g and the kinetic energy of the bullet was 25 kJ. How fast did it go?
Will give brainliest
Answers
Answer:
\(given \: \\ mass \: (m) = 50g \\ kinetic \: enegy \: (k.e) = 25kj \\ velocity(v) = x \\ form \\ k.e = \frac{1}{2} \times MV ^{2} \\ 25 = \frac{1}{2} \times 50 \times v {}^{2} \\ 25 = 25 \times v {}^{2} \\ v {}^{2} = \frac{25}{25} \\ v {}^{2} = 1 \\ v = \sqrt{1} \\ v = 1ms {}^{ - } \)
the car it go fast with velocity 1m/s
What does market value of a good or service mean?
A loss incurred on a good or service
B profit incurred on a good or service
C cost of producing a good or service
D current price of a good or service
Answers
A market value of a good or service means current price of a good or service.
option D.
What does market value of a good or service mean?Market value is the price of commodity or materials, such as an asset that's determined by the supply and demand of the asset in the marketplace.
The economic value represents the maximum amount a customer is willing to pay for something.
Also, market value is the highest price that a willing buyer will pay for a good or service and the lowest price at which a willing seller will sell his or her services.
So from the given options we can see that a market value of a good or service means current price of a good or service.
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why did you have to draw circles around each station in order to pinpoint the epicenter? why couldn't you just use the distance from each station to go directly to the epicenter in a straight line? explain.
Answers
The ratio of the three circles they draw is equal to the distances from the stations to the epicenter.
Scientists use triangulation to find the epicenter of an earthquake. If seismic data are collected from at least three different locations, their intersection can be used to determine the epicenter. Each earthquake is recorded by numerous seismometers placed in different directions.
The epicenter is the point on the surface directly above the earthquake. A seismic station uses seismometer recordings to detect earthquakes. Determining the epicenter of an earthquake requires records from three separate seismic stations. Triangulation is a method of uniquely identifying earthquakes using distance information determined from three seismic stations.
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What is the magnitude of the force needed to keep a 60. -newton rubber block moving across level, dry asphalt in a straight line at a constant speed of 2. 0 meters per second?.
Answers
Answer:
A force of μk⋅60N is needed to keep a 60-newton rubber block moving across level, dry asphalt in a straight line at a constant speed.
Explanation:
What is the minimum length of time water must remain motionless in service lines prior to first-draw residential lead sampling?
a) 2 hours
b) 4 hours
c) 6 hours
d) 8 hours
Answers
The recommended minimum length of time that water should remain motionless in service lines prior to first-draw residential lead sampling is 6 hours.
Lead can leach into drinking water from the service lines and plumbing fixtures, particularly in older homes that may have lead pipes or lead-based solder. When water sits stagnant in these pipes for a period of time, such as overnight or during the day when no one is home, the lead particles that have accumulated in the plumbing system can dissolve into the water. This is why it's important to collect first-draw samples after a period of stagnation.
The EPA recommends a 6-hour stagnation period for collecting first-draw samples from residential plumbing systems because this is typically the longest period of time that water remains stagnant in home plumbing systems. This means that the water has been sitting in the pipes long enough to allow any lead particles to leach into the water, but not so long that the water quality may be affected by other factors, such as microbial growth or chemical reactions.
It's important to note that first-draw samples are used to identify the presence of lead in the plumbing system, but they may not be representative of the actual exposure to lead that a person may experience. This is because the lead concentration in the water can vary depending on factors such as the age and condition of the plumbing system, the water chemistry, and the length of time that water has been sitting in the pipes.
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b) What was the relative speed
of the two spacecraft as they separated?
Answers
The relative speed of the two spacecraft as they separated was approximately 1 meter per second. The Apollo Lunar Module (LM) and the Command Module (CM) were connected during the mission to the moon.
After the LM was used to land on the moon's surface, it was time for the spacecraft to separate so that the astronauts could return to Earth. The LM had to perform a "lift off" and ascent stage maneuver to get back to the CM in orbit. As the LM lifted off, it started moving away from the CM at a slow speed. This was necessary to prevent any collisions between the two spacecraft. The relative speed of the LM and the CM was approximately 1 meter per second as they separated. This slow speed allowed for a safe and smooth separation between the two spacecraft. Once the LM rendezvoused with the CM, the two spacecraft docked together and the astronauts returned to Earth.
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A diffuse sound field is desired within a theater. The following room treatment would best
contribute to this acoustic characteristic:
(a) the back wall of the stage (behind the performers) is concave in shape
(b) a series of convex panels are suspended from the entire ceiling
(c) velvet curtains are hung on the side walls of the theater
(d) the back wall of the theater is finished with an acoustically reflective material
Answers
To create a diffuse sound field within a theater, the goal is to distribute sound energy evenly throughout the space, reducing the presence of distinct echoes and reflections.
Among the given options, the treatment that would best contribute to this acoustic characteristic is:
(c) Velvet curtains hung on the side walls of the theater.
Velvet curtains have a soft and textured surface that can absorb and scatter sound waves, preventing them from reflecting directly back into the audience or creating focused sound reflections. This helps to reduce the presence of strong reflections and echoes, promoting a more diffuse sound field within the theater.
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A boy is pulling his two sisters on a sled.
If one sister weigh 30.0 kg, the other
weights 40.0 kg, and the coefficient of
kinetic friction is 0.120, how much force
is required to pull the sled?
[?] N
Answers
Answer:
Explanation:
The oly way we can figure this out is if the boy is pulling the sled at a constant velocity. If not, we need a value for acceleration, and you don't have that here. If the boy is pulling the sled at a constant velocity, then the value for acceleration is 0, making this a really simple problem. I'm going with that, since there is no way to answer you otherwise. If velocity is not constant, please either repost the question or put it in the notes section under the question as it stands. If acceleration is 0, then
F - f = ma becomes
F - f = m(0) which is
F - f = 0 and
F = f which says that the applied force is the same as the frictional force. We need then to find the frictional force, which has an equation of
f = μ\(F_n\) where normal force is the same as the weight of the 2 girls. We will find that, then:
Each girl's mass is different so the normal force/weight equation is
w = (30.0)(9.8) + (40.0)(9.8) to get
w = 290 + 390 and
w = 680. Plug that into the frictional force equation:
f = (.120)(680) so
f = 82N
an earthquake sends seismic waves outward from the epicenter. the waves travel through different media in different directions. what will be true for all people who feel the earth shaking?(1 point) responses the seismic waves will travel outward at the same speed in all directions. the seismic waves will travel outward at the same speed in all directions. the amplitude of the shaking will be the same for all observers. the amplitude of the shaking will be the same for all observers. the earth will rise and fall with the same frequency. the earth will rise and fall with the same frequency. the seismic waves will be equally far apart for all observers.
Answers
Seismic waves are sent from the AP center in an earthquake. Waves move through various materials in a variety of orientations. The seismic waves would go forth at the same pace in all directions, which would be true for everyone who felt the ground trembling. Here option A is the correct answer.
When an earthquake occurs, it generates seismic waves that travel through the Earth's layers and cause the ground to shake. These waves propagate in different directions and interact with the media they encounter, including rock, soil, and water. As a result, the shaking experienced by people who feel the earthquake may vary depending on their location and the type of surface they are standing on.
Out of the given options, only option A can be considered true for all people who feel earth-shaking. This is because seismic waves travel outward from the epicenter in all directions at the same speed, regardless of the type of surface they encounter. However, the other options are not necessarily true for all observers.
Option B, which suggests that the amplitude of the shaking will be the same for all observers, is not accurate because the intensity of the shaking can vary depending on factors such as the distance from the epicenter, the direction of propagation, and the type of soil or rock that the seismic waves encounter.
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Complete question:
An earthquake sends seismic waves outward from the epicenter. the waves travel through different media in different directions. what will be true for all people who feel the earth shaking?(1 point)
A - the seismic waves will travel outward at the same speed in all directions.
B - the amplitude of the shaking will be the same for all observers.
C - the earth will rise and fall with the same frequency.
D - the seismic waves will be equally far apart for all observers.
A car is travelling at a speed of 65 miles per hour. Calculate its speed in: a. kilometers per hour b. meters per second c. feet per second
Answers
ANSWER:
a. 104.6 kilometers per hour
b. 29.1 meters per second
c. 95.3 feet per second
STEP-BY-STEP EXPLANATION:
We can calculate the equivalence in each case using the conversion factors, as follows:
\(\begin{gathered} \text{a. kilometers per hour} \\ \\ 65\frac{\text{ miles}}{\text{ hour}}\cdot\frac{1.609\text{ km}}{1\text{ miles}}=104.6\text{ kilometers per hour} \\ \\ \text{b. meters per second } \\ \\ 65\frac{\text{ miles}}{\text{ hour}}\cdot\frac{1609.34\text{ m}}{\text{ 1 miles}}\cdot\frac{1\text{ hour}}{3600\text{ seconds}}=29.1\text{ meters per second } \\ \\ \text{ c. feet per second} \\ \\ 65\frac{\text{ miles}}{\text{ hour}}\cdot\frac{5280\text{ m}}{\text{1m}\imaginaryI\text{les}}\cdot\frac{1\text{ hour}}{3600\text{ seconds}}=95.3\text{ feet per second} \end{gathered}\)Genetic recombination would be most closely associated with which process in disease-causing microorganisms?
Answers
Answer: Sexual reproduction in fungi
Explanation:
Genetic recombination is the transfer of hereditary matter between various organisms that leads to the generation of children with orders of characteristics that vary from those located in either one of the parents.
pls hurrryyyy!!!!!!!! please
Answers
Answer:
The penguins are gliding foward without stopping because there is no external force changing their state.
Explanation:
Newtons first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
for what angle of projetion is the range is maximum
Answers
Answer:
46 degrees
Explanation:
A ball rolls off a table and it traveling with a horizontal velocity of 2 m/s and 1 point
has a final vertical velocity of 3 m/s just before it hits the ground. How far
from the base of the table did the ball hit the ground?
Answers
Answer:
The velocity when the ball hits the ground is obtained using v2. 2 = v1. 2 + 2 g Dy with v1=0 and Dy=h. Thus solving for v2 yields 17.1 m/s v2 = 2 g h =.
21 pages·330 KB
Answer:
I e jofh ndoj eohe nc n very nic e
Jenny is studying a compound that has two oxygen atoms and one nitrogen atom. Which statement describes the subscripts she will use to write the chemical formula? She will use one 2 as a subscript. She will use one 2 and one 1 as subscripts. She will use one 3 as a subscript. She will use two 2s and one 1 as subscripts.
Answers
Answer:
She will use one 2 as a subscript.
Explanation:
Nitrogen is a chemical element with the symbol "N" and has an atomic number of 7. Thus, it is found in group (5) of the periodic table and as such it has 5 electrons in its outermost shell. Therefore, nitrogen has two (5) valence electrons.
On the other hand, oxygen has an atomic number of 8 and with the symbol "O."
When nitrogen and oxygen react chemically, they produce a compound known as nitrogen dioxide \( NO_{2} \)
In this scenario, Jenny is studying a compound that has two oxygen atoms and one nitrogen atom. Therefore, the statement which describes the subscripts she will use to write the chemical formula is, she will use one 2 as a subscript.
\( N + O_{2} ------> NO_{2} \)
Where: 2 represents the subscript of oxygen.
Answer:
A- she will use 2 as a subscript
Explanation: because im doing the test rn and i got it right on edg2021
question: how does the size of the milky way compare to the size of the spiral nebulae in your random sample? is the milky way many times larger than, many times smaller than, or typical of the spiral nebulae? (2 points)
Answers
Our Solar System is contained within the Milky Way galaxy, which gets its name from how it appears to us on Earth: a hazy ribbon of light visible in the night sky made up of stars that are too close together to be seen individually.
Our galaxy is around 100,000 light-years big and likely includes 100 to 400 billion stars. That sounds enormous, and it is—at least until we start putting it in the context of other galaxies.
The Milky Way is a massive cluster of stars, gas, and dust. Because it would appear to be a spinning pinwheel from the top or bottom, this galaxy is known as a spiral galaxy. About 25,000 light-years from the galactic center, on one of the spiral arms, is where the Sun can be found.
Spiral nebulae are objects that resemble spiral-shaped clouds but which are actually galaxies outside of our Milky Way galaxy.
Shapely asserted that what were then referred to as "spiral nebulae," such as Andromeda, are nearby and far smaller than the Milky Way, and that the Milky Way is so large that it is the main object in the cosmos.
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28,800 C of charge flow through a lamp every hour. Calculate the current used by this lamp
Answers
This lamp's estimated current consumption is 8 amperes.
What is electric current ?Electric current is the rate of charge (electron) passing in a conductor. The SI unit for electric current is the ampere. As current does not obey vector addition, it is a scalar quantity.
Given information:
amount of charge flowing through the lamp, Q = 28800 C;
The charge flow time was t = 1 hour = 3600 seconds.
Hence, the current passing through the bulb as a result.
I = Q/t
= 28800/3600 ampere,
= 8 ampere
Therefore, this lamp consumes 8 amperes of current.
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How many atoms are there in 0,23 g Na?
Answers
Answer:
There are 6.02*10^23 atoms in each mole (Avagadro no.) That is x moles * avagadro no. According to that, in 23 grams of sodium we have 6.02*10^23 atoms of Na.
Explanation:
Two planets are approximately a million miles away from each other. What force would be stronger between the two planets, the gravitational force or the electrical force?answer choicesThe forces would be the same.The gravitational force would be stronger.The electrical force would be stronger.Would vary depending on the orbital path.
Answers
The gravitational force would be stronger. Gravitational force is a much stronger force than electrical force and is usually the dominant force between two objects.
The gravitational force between two objects is proportional to the product of the masses of the two objects divided by the square of the distance between them. Since the distance between the two planets is a million miles, the gravitational force between them would be much greater than any electrical force that could exist between them.Gravitational force is the force of attraction between two objects that have mass. It is one of the four fundamental forces of nature, and it is the weakest of the four forces. The strength of the gravitational force between two objects depends on their mass and the distance between them.
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The average molar mass of the components of air (mainly diatomic oxygen gas and
diatomic nitrogen gas) is about 29 g/mol. What is the volume of 1.0 kg of air at
atmospheric pressure and 20.0°C?
Answers
The volume of the air that we have from the question is 829 L
What is the volume?
The ideal gas equation, also known as the ideal gas law, is a fundamental equation in thermodynamics that describes the relationship between the pressure (P), volume (V), temperature (T), and number of moles (n) of an ideal gas.
We know that;
PV = nRT
P = pressure
V = volume
n = Number pf moles
R = gas constant
T = Temperature
Then;
Number of moles of the air = 1000 g/29 g/mol
= 34.5 moles
Then;
V = nRT/P
V = 34.5 * 0.082 * 293/1
V = 829 L
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anyone that can help???
Answers
Answer:
Explanation:
56) A
57) E
If the voltage amplitude across an 8.50-nF capacitor is equal to 12.0 V when the current amplitude through it is 3.33 mA, the frequency is closest to:A) 5.20 B) 32.6 kHz. C) 32.6 D) 5.20 kHz. E) 32.6 Hz. MHz. MHz.
Answers
If the voltage amplitude across an 8.50-nF capacitor is equal to 12.0 V when the current amplitude through it is 3.33 mA, the frequency is 5.20 kHz (Option D).
To find the frequency when the voltage amplitude across an 8.50-nF capacitor is equal to 12.0 V and the current amplitude through it is 3.33 mA, you can use the formula:
Voltage Amplitude (V) = Current Amplitude (I) * Capacitive Reactance (Xc)
First, find the capacitive reactance (Xc) using the formula:
Xc = 1 / (2 * π * f * C)
Where f is the frequency and C is the capacitance.
Rearrange the formula to solve for the frequency:
f = 1 / (2 * π * C * Xc)
Since Voltage Amplitude = Current Amplitude * Capacitive Reactance:
Xc = Voltage Amplitude / Current Amplitude
Xc = 12.0 V / 3.33 mA = 12.0 V / 0.00333 A = 3603.60 Ω
Now, plug Xc and C into the frequency formula:
f = 1 / (2 * π * 8.50 nF * 3603.60 Ω)
f = 1 / (2 * π * 8.50 × 10⁻⁹ F * 3603.60 Ω)
f ≈ 5200 Hz
The frequency is closest to 5.20 kHz (Option D).
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A boy spins a top on a table. How can he increase the total energy of this
system?
Answers
A boy spins a top on a table. he can increase the total energy of this
system by spinning the top faster. Option C
This is further explained below.
What is Total Energy.?Generally, The whole end consumption of energy at a certain branch or variable is referred to as "Total Energy."
Total energy is distinguished from Final Energy Intensity by the fact that data pertaining to energy is entered directly; more specifically, the total energy is not stipulated as the product of an activity level and energy intensity.
This means that total energy is not the same as Final Energy Intensity.
In conclusion, On a table, a little child is seen spinning a top. By spinning the top at a quicker rate, he will be able to boost the system's overall energy output. Alternative C
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When a car goes around a curve at a constant speed, in which direction is it accelerating?
Answers
Answer: towards the centre of the curve/circle
Explanation:
centripetal force always points towards the centre of the circle. the speed stays constant, but the direction of motion changes as the object moves across the curve, therefore there is an acceleration.
Answer:
See below
Explanation:
Toward the center of the curve
think about it....when you are in a car and accelerate FORWARD, you are pushed BACK...opposite the accel
when you are going around a curve you are pushed to the outside of the curve...opposite the accel which is toward the center of the curve
The mechanical advantage of a wheel and axle is the radius of the wheel divided by the radius of the axle.
What is the mechanical advantage of the wheel and axle shown below?
Answers
Answer:
i got 6
Explanation:lmk if i’m wrong
when an object is allowed to fall freely near the surface of the earth, the gravitational pull is such that the object falls 16 ft in the first second, 48 ft in the next second, 80 ft in the next second, and so on. a. find the total distance a ball falls in 6 s.
b. find a formula for the total distance a ball falls in n seconds.
Answers
a) The total distance a ball falls in 6 seconds is 576 feet.
b) The formula for the total distance a ball falls in n seconds is:
S_n = 16n * (n + 1) / 2
a. To find the total distance a ball falls in 6 seconds, we need to sum up the distances it falls during each second. Based on the given information, the distances are:
1st second: 16 ft
2nd second: 48 ft
3rd second: 80 ft
We can observe a pattern here: the distance increases by 32 ft each second (16, 48, 80, 112, 144, 176). So, the distances for the remaining seconds are:
4th second: 112 ft
5th second: 144 ft
6th second: 176 ft
Now, we can sum up these distances: 16 + 48 + 80 + 112 + 144 + 176 = 576 ft. Therefore, the total distance a ball falls in 6 seconds is 576 feet.
b. To find a formula for the total distance a ball falls in n seconds, we can notice that the sequence of distances forms an arithmetic progression with the first term a = 16 and the common difference d = 32. The formula for the sum of the first n terms of an arithmetic progression is:
S_n = n * (2a + (n - 1)d) / 2
In our case, S_n represents the total distance a ball falls in n seconds. Plugging in the values for a and d, we get:
S_n = n * (2 * 16 + (n - 1) * 32) / 2
Simplifying, the formula for the total distance a ball falls in n seconds is:
S_n = 16n * (n + 1) / 2
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(BRAINLIEST!) Does more momentum mean more force?
Answers
Answer:
no.
Explanation:
A learner has a mixture of sand and water. The best method to separate this solution would be ?
Answers
Answer:
An filtration is the answer.
(b) In a constant head permeameter test the following results were obtained: Duration of test =300 seconds Quantity of water collected =500ml Head difference in manometer =45 mm Distance between manometer tappings =100 mm Diameter of test sample =100 mm From the data above, calculate the; (i) Hydraulic gradient. (ii) Flow rate. (iii) Hydraulic conductivity.
Answers
(i) The hydraulic gradient is 0.45.
(ii) The flow rate is approximately 0.00000167 cubic meters per second.
(iii) The hydraulic conductivity is approximately 0.000037 meters per second.
(i) Hydraulic gradient:
The hydraulic gradient (i) can be calculated by dividing the head difference (h) by the distance (L) between the manometer tappings:
i = h / L
Given:
Head difference (h) = 45 mm
Distance between manometer tappings (L) = 100 mm
Converting the units to meters:
h = 45 mm / 1000 = 0.045 m
L = 100 mm / 1000 = 0.1 m
Substituting the values into the formula:
i = 0.045 m / 0.1 m = 0.45
(ii) Flow rate:
The flow rate (Q) can be calculated using the equation:
Q = (V / t) / A
Where V is the quantity of water collected, t is the duration of the test, and A is the cross-sectional area of the test sample.
Given:
Quantity of water collected (V) = 500 ml = 0.5 L
Duration of test (t) = 300 seconds
Diameter of test sample (d) = 100 mm
Converting the units to meters:
V = 0.5 L = 0.5 / 1000 = 0.0005 m³
t = 300 seconds
d = 100 mm / 1000 = 0.1 m
Calculating the cross-sectional area (A) using the formula for the area of a circle:
A = π * (d/2)^2
Substituting the values:
A = π * (0.1/2)^2 = π * 0.005^2 = 0.00007854 m²
Substituting the values into the formula for flow rate:
Q = (0.0005 m³ / 300 s) / 0.00007854 m²
Calculating the flow rate:
Q = 0.00000167 m³/s
(iii) Hydraulic conductivity:
The hydraulic conductivity (K) can be calculated using Darcy's Law:
K = Q / (A * i)
Given the values we calculated:
Q = 0.00000167 m³/s
A = 0.00007854 m²
i = 0.45
Substituting the values into the formula:
K = 0.00000167 m³/s / (0.00007854 m² * 0.45)
Calculating the hydraulic conductivity:
K ≈ 0.000037 m/s
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A bat flies toward a wall, emitting a steady sound of frequency 1. 70 khz. This bat hears its own sound plus the sound reflected by the wall. How fast should the bat fly in order to hear a beat frequency of 8. 00 hz?.
Answers
The bat should fly about 0.8065 m/s in order to hear a beat frequency of 8 Hz.
The shift in a wave's frequency caused by an observer moving away from the wave source is known as the Doppler effect or Doppler shift. The equation for this is given by,
\(f=\frac{v \pm v_0}{v\mp v_s}f_s\)
where f is the observed frequency, v is the speed or velocity of the sound waves, v₀ is observer velocity ("+" if it's towards and "-" if it's away from the source), vs is source velocity("-" if it's towards and "+" if it's away from the observer), and fs is the actual frequency of the sound waves.
The velocity of sound waves in the air is 344 m/s, v₀ is zero for the incident, v is the source velocity towards the wall, and fs is 1700 Hz.
Then, the incident frequency is given by,
\(f_{incidence}=\frac{344-0}{344-v}\times f_s\)
The wall is stationary, therefore, f(incidence)=f(reflected). Then, the new frequency the bat hears is,
\(\begin{aligned}f_{new}&=\frac{344+v}{344}\times f_{reflected}\\&=\frac{344+v}{344}\times \frac{344-0}{344-v}\times f_s\\&=\frac{344+v}{344-v} \times f_s\end{aligned}\)
To hear a beat frequency of 8 Hz, the velocity of the bat should be,
\(\begin{aligned}f_{new}-f_s&=8\\\left(\frac{344+v}{344-v} \right)f_s-f_s&=8\\\frac{344+v}{344-v}-1&=\frac{8}{f_s}\\\frac{344+v-344+v}{344-v}&=\frac{8}{1700}\\2v&=0.0047(344-v)\\2v&=1.6168-0.0047v\\2.0047v&=1.6168\\v&=\mathrm{0.8065\;m/s}\end{aligned}\)
The answer is 0.8065 m/s.
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